Flora of North America species comparison

4-10(-15) dm, sparingly to moderately prickly.

3-6 dm, densely prickly and crisped-hispid.

blades: abaxial surface sparingly prickly on main veins, adaxial surface unarmed or sparingly prickly on main veins;

basal and proximal lobed 1/2-4/5 distance to midrib;

distal clasping.

blades: surfaces sparsely to densely crisped-hispid between veins, abaxial surface mostly densely prickly on midrib and main veins, adaxial surface less so;

proximal lobed 4/5 distance to midrib;

distal not clasping.

buds broadly ellipsoid to subglobose, body 12-18 × 10-16 mm, sparingly to rather closely prickly;

sepal horns terete, 3-6(-10) mm, usually unarmed.

buds oblong, body 16-20 × 14-18 mm, prickly and hispid;

sepal horns 4-7 mm, prickly, apical prickle flattened, indurate.

5-10 cm broad, closely to more distantly subtended by 1-2 foliaceous bracts;

petals white;

stamens 150 or more;

filaments lemon yellow;

pistil (3-)4-5(-7)-carpellate.

7-10 cm broad;

petals white;

stamens 150 or more;

filaments pale yellow;

pistil 3-4-carpellate.

oblong, oblong-ellipsoid, or narrowly ellipsoid, 20-40(-45) × 10-15(-25) mm (including stigma and excluding prickles), prickly, surface clearly visible to partially obscured, longest prickles widely spaced, 6-10(-12) mm, sometimes interspersed with smaller ones.

ovoid, 30-40 × 12-18 mm (including stigma and excluding prickles), densely prickly, surface obscured, longest prickles straight or incurved, ca. 5 mm.

1.6-2 mm.

ca. 2.5 mm.